package com.zdb.demo.design.principle.singleresponsibility;

public class CourseIml implements ICourseContent, ICourseManager {
    @Override
    public String getCourseName() {
        return null;
    }

    @Override
    public byte[] getCourseVedio() {
        return new byte[0];
    }

    @Override
    public void buyCourse() {

    }

    @Override
    public void refundCourse() {

    }
}
